Kelly Osbourne: A History of Her Celebrity Disses

After Joan Rivers insulted Rihanna on their Fashion Police show, Kelly Osbourne defended her co-star. She tweeted, "Sticking up for her boss and staying classy at the same time, Osbourne tweeted, “W/ the greatest of respect 2 a young lady of whom I love please get a sense of humor @Joan_Rivers paved the way 4 all us opinionated ladies!"